Fix compiling core to JS targets

Author: PlasmaPower

core/rawdb/freezer.go

@@ -21,7 +21,6 @@ import (
 	"fmt"
 	"math"
 	"os"
-	"path/filepath"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -31,7 +30,6 @@ import (
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/params"
-	"github.com/prometheus/tsdb/fileutil"
 )
 
 var (
@@ -84,9 +82,8 @@ type freezer struct {
 	writeLock  sync.Mutex
 	writeBatch *freezerBatch
 
-	readonly     bool
-	tables       map[string]*freezerTable // Data tables for storing everything
-	instanceLock fileutil.Releaser        // File-system lock to prevent double opens
+	readonly bool
+	tables   map[string]*freezerTable // Data tables for storing everything
 
 	trigger chan chan struct{} // Manual blocking freeze trigger, test determinism
 
@@ -114,20 +111,13 @@ func newFreezer(datadir string, namespace string, readonly bool, maxTableSize ui
 			return nil, errSymlinkDatadir
 		}
 	}
-	// Leveldb uses LOCK as the filelock filename. To prevent the
-	// name collision, we use FLOCK as the lock name.
-	lock, _, err := fileutil.Flock(filepath.Join(datadir, "FLOCK"))
-	if err != nil {
-		return nil, err
-	}
 	// Open all the supported data tables
 	freezer := &freezer{
-		readonly:     readonly,
-		threshold:    params.FullImmutabilityThreshold,
-		tables:       make(map[string]*freezerTable),
-		instanceLock: lock,
-		trigger:      make(chan chan struct{}),
-		quit:         make(chan struct{}),
+		readonly:  readonly,
+		threshold: params.FullImmutabilityThreshold,
+		tables:    make(map[string]*freezerTable),
+		trigger:   make(chan chan struct{}),
+		quit:      make(chan struct{}),
 	}
 
 	// Create the tables.
@@ -137,7 +127,6 @@ func newFreezer(datadir string, namespace string, readonly bool, maxTableSize ui
 			for _, table := range freezer.tables {
 				table.Close()
 			}
-			lock.Release()
 			return nil, err
 		}
 		freezer.tables[name] = table
@@ -148,7 +137,6 @@ func newFreezer(datadir string, namespace string, readonly bool, maxTableSize ui
 		for _, table := range freezer.tables {
 			table.Close()
 		}
-		lock.Release()
 		return nil, err
 	}
 
@@ -174,9 +162,6 @@ func (f *freezer) Close() error {
 				errs = append(errs, err)
 			}
 		}
-		if err := f.instanceLock.Release(); err != nil {
-			errs = append(errs, err)
-		}
 	})
 	if errs != nil {
 		return fmt.Errorf("%v", errs)

ethdb/leveldb/fake_leveldb.go

@@ -0,0 +1,120 @@
+// Copyright 2021 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+//go:build js
+// +build js
+
+// Package leveldb implements the key-value database layer based on LevelDB.
+package leveldb
+
+import (
+	"errors"
+
+	"github.com/ethereum/go-ethereum/ethdb"
+)
+
+type Database struct {
+	unconstructable struct{}
+}
+
+// New returns a wrapped LevelDB object. The namespace is the prefix that the
+// metrics reporting should use for surfacing internal stats.
+func New(file string, cache int, handles int, namespace string, readonly bool) (*Database, error) {
+	return nil, errors.New("leveldb is unavailable on JS platforms")
+}
+
+/*
+// NewCustom returns a wrapped LevelDB object. The namespace is the prefix that the
+// metrics reporting should use for surfacing internal stats.
+// The customize function allows the caller to modify the leveldb options.
+func NewCustom(file string, namespace string, customize func(options *opt.Options)) (*Database, error) {
+	return nil, errors.New("leveldb is unavailable on JS platforms")
+}
+
+// configureOptions sets some default options, then runs the provided setter.
+func configureOptions(customizeFn func(*opt.Options)) *opt.Options {
+	// Set default options
+	options := &opt.Options{
+		Filter:                 filter.NewBloomFilter(10),
+		DisableSeeksCompaction: true,
+	}
+	// Allow caller to make custom modifications to the options
+	if customizeFn != nil {
+		customizeFn(options)
+	}
+	return options
+}
+*/
+
+// Close stops the metrics collection, flushes any pending data to disk and closes
+// all io accesses to the underlying key-value store.
+func (db *Database) Close() error {
+	panic("Method called on unconstructable leveldb database")
+}
+
+// Has retrieves if a key is present in the key-value store.
+func (db *Database) Has(key []byte) (bool, error) {
+	panic("Method called on unconstructable leveldb database")
+}
+
+// Get retrieves the given key if it's present in the key-value store.
+func (db *Database) Get(key []byte) ([]byte, error) {
+	panic("Method called on unconstructable leveldb database")
+}
+
+// Put inserts the given value into the key-value store.
+func (db *Database) Put(key []byte, value []byte) error {
+	panic("Method called on unconstructable leveldb database")
+}
+
+// Delete removes the key from the key-value store.
+func (db *Database) Delete(key []byte) error {
+	panic("Method called on unconstructable leveldb database")
+}
+
+// NewBatch creates a write-only key-value store that buffers changes to its host
+// database until a final write is called.
+func (db *Database) NewBatch() ethdb.Batch {
+	panic("Method called on unconstructable leveldb database")
+}
+
+// NewIterator creates a binary-alphabetical iterator over a subset
+// of database content with a particular key prefix, starting at a particular
+// initial key (or after, if it does not exist).
+func (db *Database) NewIterator(prefix []byte, start []byte) ethdb.Iterator {
+	panic("Method called on unconstructable leveldb database")
+}
+
+// Stat returns a particular internal stat of the database.
+func (db *Database) Stat(property string) (string, error) {
+	panic("Method called on unconstructable leveldb database")
+}
+
+// Compact flattens the underlying data store for the given key range. In essence,
+// deleted and overwritten versions are discarded, and the data is rearranged to
+// reduce the cost of operations needed to access them.
+//
+// A nil start is treated as a key before all keys in the data store; a nil limit
+// is treated as a key after all keys in the data store. If both is nil then it
+// will compact entire data store.
+func (db *Database) Compact(start []byte, limit []byte) error {
+	panic("Method called on unconstructable leveldb database")
+}
+
+// Path returns the path to the database directory.
+func (db *Database) Path() string {
+	panic("Method called on unconstructable leveldb database")
+}